1 /* 2 * X.25 Packet Layer release 002 3 * 4 * This is ALPHA test software. This code may break your machine, 5 * randomly fail to work with new releases, misbehave and/or generally 6 * screw up. It might even work. 7 * 8 * This code REQUIRES 2.1.15 or higher 9 * 10 * This module: 11 * This module is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 * 16 * History 17 * X.25 001 Jonathan Naylor Started coding. 18 * X.25 002 Jonathan Naylor Centralised disconnect handling. 19 * New timer architecture. 20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 22 * facilities negotiation and increased 23 * the throughput upper limit. 24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 26 * Fixed x25_output() related skb leakage. 27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 31 * x25_proc.c, using seq_file 32 * 2005-04-02 Shaun Pereira Selective sub address matching 33 * with call user data 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on 35 * response 36 */ 37 38 #include <linux/module.h> 39 #include <linux/capability.h> 40 #include <linux/errno.h> 41 #include <linux/kernel.h> 42 #include <linux/sched.h> 43 #include <linux/timer.h> 44 #include <linux/string.h> 45 #include <linux/net.h> 46 #include <linux/netdevice.h> 47 #include <linux/if_arp.h> 48 #include <linux/skbuff.h> 49 #include <linux/slab.h> 50 #include <net/sock.h> 51 #include <net/tcp_states.h> 52 #include <asm/uaccess.h> 53 #include <linux/fcntl.h> 54 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 55 #include <linux/notifier.h> 56 #include <linux/init.h> 57 #include <linux/compat.h> 58 #include <linux/ctype.h> 59 60 #include <net/x25.h> 61 #include <net/compat.h> 62 63 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 64 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 65 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 66 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 67 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 68 int sysctl_x25_forward = 0; 69 70 HLIST_HEAD(x25_list); 71 DEFINE_RWLOCK(x25_list_lock); 72 73 static const struct proto_ops x25_proto_ops; 74 75 static struct x25_address null_x25_address = {" "}; 76 77 #ifdef CONFIG_COMPAT 78 struct compat_x25_subscrip_struct { 79 char device[200-sizeof(compat_ulong_t)]; 80 compat_ulong_t global_facil_mask; 81 compat_uint_t extended; 82 }; 83 #endif 84 85 86 int x25_parse_address_block(struct sk_buff *skb, 87 struct x25_address *called_addr, 88 struct x25_address *calling_addr) 89 { 90 unsigned char len; 91 int needed; 92 int rc; 93 94 if (skb->len < 1) { 95 /* packet has no address block */ 96 rc = 0; 97 goto empty; 98 } 99 100 len = *skb->data; 101 needed = 1 + (len >> 4) + (len & 0x0f); 102 103 if (skb->len < needed) { 104 /* packet is too short to hold the addresses it claims 105 to hold */ 106 rc = -1; 107 goto empty; 108 } 109 110 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 111 112 empty: 113 *called_addr->x25_addr = 0; 114 *calling_addr->x25_addr = 0; 115 116 return rc; 117 } 118 119 120 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 121 struct x25_address *calling_addr) 122 { 123 unsigned int called_len, calling_len; 124 char *called, *calling; 125 unsigned int i; 126 127 called_len = (*p >> 0) & 0x0F; 128 calling_len = (*p >> 4) & 0x0F; 129 130 called = called_addr->x25_addr; 131 calling = calling_addr->x25_addr; 132 p++; 133 134 for (i = 0; i < (called_len + calling_len); i++) { 135 if (i < called_len) { 136 if (i % 2 != 0) { 137 *called++ = ((*p >> 0) & 0x0F) + '0'; 138 p++; 139 } else { 140 *called++ = ((*p >> 4) & 0x0F) + '0'; 141 } 142 } else { 143 if (i % 2 != 0) { 144 *calling++ = ((*p >> 0) & 0x0F) + '0'; 145 p++; 146 } else { 147 *calling++ = ((*p >> 4) & 0x0F) + '0'; 148 } 149 } 150 } 151 152 *called = *calling = '\0'; 153 154 return 1 + (called_len + calling_len + 1) / 2; 155 } 156 157 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 158 struct x25_address *calling_addr) 159 { 160 unsigned int called_len, calling_len; 161 char *called, *calling; 162 int i; 163 164 called = called_addr->x25_addr; 165 calling = calling_addr->x25_addr; 166 167 called_len = strlen(called); 168 calling_len = strlen(calling); 169 170 *p++ = (calling_len << 4) | (called_len << 0); 171 172 for (i = 0; i < (called_len + calling_len); i++) { 173 if (i < called_len) { 174 if (i % 2 != 0) { 175 *p |= (*called++ - '0') << 0; 176 p++; 177 } else { 178 *p = 0x00; 179 *p |= (*called++ - '0') << 4; 180 } 181 } else { 182 if (i % 2 != 0) { 183 *p |= (*calling++ - '0') << 0; 184 p++; 185 } else { 186 *p = 0x00; 187 *p |= (*calling++ - '0') << 4; 188 } 189 } 190 } 191 192 return 1 + (called_len + calling_len + 1) / 2; 193 } 194 195 /* 196 * Socket removal during an interrupt is now safe. 197 */ 198 static void x25_remove_socket(struct sock *sk) 199 { 200 write_lock_bh(&x25_list_lock); 201 sk_del_node_init(sk); 202 write_unlock_bh(&x25_list_lock); 203 } 204 205 /* 206 * Kill all bound sockets on a dropped device. 207 */ 208 static void x25_kill_by_device(struct net_device *dev) 209 { 210 struct sock *s; 211 struct hlist_node *node; 212 213 write_lock_bh(&x25_list_lock); 214 215 sk_for_each(s, node, &x25_list) 216 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 217 x25_disconnect(s, ENETUNREACH, 0, 0); 218 219 write_unlock_bh(&x25_list_lock); 220 } 221 222 /* 223 * Handle device status changes. 224 */ 225 static int x25_device_event(struct notifier_block *this, unsigned long event, 226 void *ptr) 227 { 228 struct net_device *dev = ptr; 229 struct x25_neigh *nb; 230 231 if (!net_eq(dev_net(dev), &init_net)) 232 return NOTIFY_DONE; 233 234 if (dev->type == ARPHRD_X25 235 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) 236 || dev->type == ARPHRD_ETHER 237 #endif 238 ) { 239 switch (event) { 240 case NETDEV_UP: 241 x25_link_device_up(dev); 242 break; 243 case NETDEV_GOING_DOWN: 244 nb = x25_get_neigh(dev); 245 if (nb) { 246 x25_terminate_link(nb); 247 x25_neigh_put(nb); 248 } 249 break; 250 case NETDEV_DOWN: 251 x25_kill_by_device(dev); 252 x25_route_device_down(dev); 253 x25_link_device_down(dev); 254 break; 255 } 256 } 257 258 return NOTIFY_DONE; 259 } 260 261 /* 262 * Add a socket to the bound sockets list. 263 */ 264 static void x25_insert_socket(struct sock *sk) 265 { 266 write_lock_bh(&x25_list_lock); 267 sk_add_node(sk, &x25_list); 268 write_unlock_bh(&x25_list_lock); 269 } 270 271 /* 272 * Find a socket that wants to accept the Call Request we just 273 * received. Check the full list for an address/cud match. 274 * If no cuds match return the next_best thing, an address match. 275 * Note: if a listening socket has cud set it must only get calls 276 * with matching cud. 277 */ 278 static struct sock *x25_find_listener(struct x25_address *addr, 279 struct sk_buff *skb) 280 { 281 struct sock *s; 282 struct sock *next_best; 283 struct hlist_node *node; 284 285 read_lock_bh(&x25_list_lock); 286 next_best = NULL; 287 288 sk_for_each(s, node, &x25_list) 289 if ((!strcmp(addr->x25_addr, 290 x25_sk(s)->source_addr.x25_addr) || 291 !strcmp(addr->x25_addr, 292 null_x25_address.x25_addr)) && 293 s->sk_state == TCP_LISTEN) { 294 /* 295 * Found a listening socket, now check the incoming 296 * call user data vs this sockets call user data 297 */ 298 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { 299 if((memcmp(x25_sk(s)->calluserdata.cuddata, 300 skb->data, 301 x25_sk(s)->cudmatchlength)) == 0) { 302 sock_hold(s); 303 goto found; 304 } 305 } else 306 next_best = s; 307 } 308 if (next_best) { 309 s = next_best; 310 sock_hold(s); 311 goto found; 312 } 313 s = NULL; 314 found: 315 read_unlock_bh(&x25_list_lock); 316 return s; 317 } 318 319 /* 320 * Find a connected X.25 socket given my LCI and neighbour. 321 */ 322 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 323 { 324 struct sock *s; 325 struct hlist_node *node; 326 327 sk_for_each(s, node, &x25_list) 328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 329 sock_hold(s); 330 goto found; 331 } 332 s = NULL; 333 found: 334 return s; 335 } 336 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 338 { 339 struct sock *s; 340 341 read_lock_bh(&x25_list_lock); 342 s = __x25_find_socket(lci, nb); 343 read_unlock_bh(&x25_list_lock); 344 return s; 345 } 346 347 /* 348 * Find a unique LCI for a given device. 349 */ 350 static unsigned int x25_new_lci(struct x25_neigh *nb) 351 { 352 unsigned int lci = 1; 353 struct sock *sk; 354 355 read_lock_bh(&x25_list_lock); 356 357 while ((sk = __x25_find_socket(lci, nb)) != NULL) { 358 sock_put(sk); 359 if (++lci == 4096) { 360 lci = 0; 361 break; 362 } 363 } 364 365 read_unlock_bh(&x25_list_lock); 366 return lci; 367 } 368 369 /* 370 * Deferred destroy. 371 */ 372 static void __x25_destroy_socket(struct sock *); 373 374 /* 375 * handler for deferred kills. 376 */ 377 static void x25_destroy_timer(unsigned long data) 378 { 379 x25_destroy_socket_from_timer((struct sock *)data); 380 } 381 382 /* 383 * This is called from user mode and the timers. Thus it protects itself 384 * against interrupt users but doesn't worry about being called during 385 * work. Once it is removed from the queue no interrupt or bottom half 386 * will touch it and we are (fairly 8-) ) safe. 387 * Not static as it's used by the timer 388 */ 389 static void __x25_destroy_socket(struct sock *sk) 390 { 391 struct sk_buff *skb; 392 393 x25_stop_heartbeat(sk); 394 x25_stop_timer(sk); 395 396 x25_remove_socket(sk); 397 x25_clear_queues(sk); /* Flush the queues */ 398 399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 400 if (skb->sk != sk) { /* A pending connection */ 401 /* 402 * Queue the unaccepted socket for death 403 */ 404 skb->sk->sk_state = TCP_LISTEN; 405 sock_set_flag(skb->sk, SOCK_DEAD); 406 x25_start_heartbeat(skb->sk); 407 x25_sk(skb->sk)->state = X25_STATE_0; 408 } 409 410 kfree_skb(skb); 411 } 412 413 if (sk_has_allocations(sk)) { 414 /* Defer: outstanding buffers */ 415 sk->sk_timer.expires = jiffies + 10 * HZ; 416 sk->sk_timer.function = x25_destroy_timer; 417 sk->sk_timer.data = (unsigned long)sk; 418 add_timer(&sk->sk_timer); 419 } else { 420 /* drop last reference so sock_put will free */ 421 __sock_put(sk); 422 } 423 } 424 425 void x25_destroy_socket_from_timer(struct sock *sk) 426 { 427 sock_hold(sk); 428 bh_lock_sock(sk); 429 __x25_destroy_socket(sk); 430 bh_unlock_sock(sk); 431 sock_put(sk); 432 } 433 434 /* 435 * Handling for system calls applied via the various interfaces to a 436 * X.25 socket object. 437 */ 438 439 static int x25_setsockopt(struct socket *sock, int level, int optname, 440 char __user *optval, unsigned int optlen) 441 { 442 int opt; 443 struct sock *sk = sock->sk; 444 int rc = -ENOPROTOOPT; 445 446 if (level != SOL_X25 || optname != X25_QBITINCL) 447 goto out; 448 449 rc = -EINVAL; 450 if (optlen < sizeof(int)) 451 goto out; 452 453 rc = -EFAULT; 454 if (get_user(opt, (int __user *)optval)) 455 goto out; 456 457 if (opt) 458 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 459 else 460 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 461 rc = 0; 462 out: 463 return rc; 464 } 465 466 static int x25_getsockopt(struct socket *sock, int level, int optname, 467 char __user *optval, int __user *optlen) 468 { 469 struct sock *sk = sock->sk; 470 int val, len, rc = -ENOPROTOOPT; 471 472 if (level != SOL_X25 || optname != X25_QBITINCL) 473 goto out; 474 475 rc = -EFAULT; 476 if (get_user(len, optlen)) 477 goto out; 478 479 len = min_t(unsigned int, len, sizeof(int)); 480 481 rc = -EINVAL; 482 if (len < 0) 483 goto out; 484 485 rc = -EFAULT; 486 if (put_user(len, optlen)) 487 goto out; 488 489 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 490 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 491 out: 492 return rc; 493 } 494 495 static int x25_listen(struct socket *sock, int backlog) 496 { 497 struct sock *sk = sock->sk; 498 int rc = -EOPNOTSUPP; 499 500 lock_sock(sk); 501 if (sk->sk_state != TCP_LISTEN) { 502 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 503 sk->sk_max_ack_backlog = backlog; 504 sk->sk_state = TCP_LISTEN; 505 rc = 0; 506 } 507 release_sock(sk); 508 509 return rc; 510 } 511 512 static struct proto x25_proto = { 513 .name = "X25", 514 .owner = THIS_MODULE, 515 .obj_size = sizeof(struct x25_sock), 516 }; 517 518 static struct sock *x25_alloc_socket(struct net *net) 519 { 520 struct x25_sock *x25; 521 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto); 522 523 if (!sk) 524 goto out; 525 526 sock_init_data(NULL, sk); 527 528 x25 = x25_sk(sk); 529 skb_queue_head_init(&x25->ack_queue); 530 skb_queue_head_init(&x25->fragment_queue); 531 skb_queue_head_init(&x25->interrupt_in_queue); 532 skb_queue_head_init(&x25->interrupt_out_queue); 533 out: 534 return sk; 535 } 536 537 static int x25_create(struct net *net, struct socket *sock, int protocol, 538 int kern) 539 { 540 struct sock *sk; 541 struct x25_sock *x25; 542 int rc = -EAFNOSUPPORT; 543 544 if (!net_eq(net, &init_net)) 545 goto out; 546 547 rc = -ESOCKTNOSUPPORT; 548 if (sock->type != SOCK_SEQPACKET) 549 goto out; 550 551 rc = -EINVAL; 552 if (protocol) 553 goto out; 554 555 rc = -ENOBUFS; 556 if ((sk = x25_alloc_socket(net)) == NULL) 557 goto out; 558 559 x25 = x25_sk(sk); 560 561 sock_init_data(sock, sk); 562 563 x25_init_timers(sk); 564 565 sock->ops = &x25_proto_ops; 566 sk->sk_protocol = protocol; 567 sk->sk_backlog_rcv = x25_backlog_rcv; 568 569 x25->t21 = sysctl_x25_call_request_timeout; 570 x25->t22 = sysctl_x25_reset_request_timeout; 571 x25->t23 = sysctl_x25_clear_request_timeout; 572 x25->t2 = sysctl_x25_ack_holdback_timeout; 573 x25->state = X25_STATE_0; 574 x25->cudmatchlength = 0; 575 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 576 /* on call accept */ 577 578 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 579 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 580 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 581 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 582 x25->facilities.throughput = 0; /* by default don't negotiate 583 throughput */ 584 x25->facilities.reverse = X25_DEFAULT_REVERSE; 585 x25->dte_facilities.calling_len = 0; 586 x25->dte_facilities.called_len = 0; 587 memset(x25->dte_facilities.called_ae, '\0', 588 sizeof(x25->dte_facilities.called_ae)); 589 memset(x25->dte_facilities.calling_ae, '\0', 590 sizeof(x25->dte_facilities.calling_ae)); 591 592 rc = 0; 593 out: 594 return rc; 595 } 596 597 static struct sock *x25_make_new(struct sock *osk) 598 { 599 struct sock *sk = NULL; 600 struct x25_sock *x25, *ox25; 601 602 if (osk->sk_type != SOCK_SEQPACKET) 603 goto out; 604 605 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL) 606 goto out; 607 608 x25 = x25_sk(sk); 609 610 sk->sk_type = osk->sk_type; 611 sk->sk_priority = osk->sk_priority; 612 sk->sk_protocol = osk->sk_protocol; 613 sk->sk_rcvbuf = osk->sk_rcvbuf; 614 sk->sk_sndbuf = osk->sk_sndbuf; 615 sk->sk_state = TCP_ESTABLISHED; 616 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 617 sock_copy_flags(sk, osk); 618 619 ox25 = x25_sk(osk); 620 x25->t21 = ox25->t21; 621 x25->t22 = ox25->t22; 622 x25->t23 = ox25->t23; 623 x25->t2 = ox25->t2; 624 x25->flags = ox25->flags; 625 x25->facilities = ox25->facilities; 626 x25->dte_facilities = ox25->dte_facilities; 627 x25->cudmatchlength = ox25->cudmatchlength; 628 629 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 630 x25_init_timers(sk); 631 out: 632 return sk; 633 } 634 635 static int x25_release(struct socket *sock) 636 { 637 struct sock *sk = sock->sk; 638 struct x25_sock *x25; 639 640 if (!sk) 641 return 0; 642 643 x25 = x25_sk(sk); 644 645 sock_hold(sk); 646 lock_sock(sk); 647 switch (x25->state) { 648 649 case X25_STATE_0: 650 case X25_STATE_2: 651 x25_disconnect(sk, 0, 0, 0); 652 __x25_destroy_socket(sk); 653 goto out; 654 655 case X25_STATE_1: 656 case X25_STATE_3: 657 case X25_STATE_4: 658 x25_clear_queues(sk); 659 x25_write_internal(sk, X25_CLEAR_REQUEST); 660 x25_start_t23timer(sk); 661 x25->state = X25_STATE_2; 662 sk->sk_state = TCP_CLOSE; 663 sk->sk_shutdown |= SEND_SHUTDOWN; 664 sk->sk_state_change(sk); 665 sock_set_flag(sk, SOCK_DEAD); 666 sock_set_flag(sk, SOCK_DESTROY); 667 break; 668 } 669 670 sock_orphan(sk); 671 out: 672 release_sock(sk); 673 sock_put(sk); 674 return 0; 675 } 676 677 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 678 { 679 struct sock *sk = sock->sk; 680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 681 int len, i, rc = 0; 682 683 if (!sock_flag(sk, SOCK_ZAPPED) || 684 addr_len != sizeof(struct sockaddr_x25) || 685 addr->sx25_family != AF_X25) { 686 rc = -EINVAL; 687 goto out; 688 } 689 690 len = strlen(addr->sx25_addr.x25_addr); 691 for (i = 0; i < len; i++) { 692 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 693 rc = -EINVAL; 694 goto out; 695 } 696 } 697 698 lock_sock(sk); 699 x25_sk(sk)->source_addr = addr->sx25_addr; 700 x25_insert_socket(sk); 701 sock_reset_flag(sk, SOCK_ZAPPED); 702 release_sock(sk); 703 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 704 out: 705 return rc; 706 } 707 708 static int x25_wait_for_connection_establishment(struct sock *sk) 709 { 710 DECLARE_WAITQUEUE(wait, current); 711 int rc; 712 713 add_wait_queue_exclusive(sk_sleep(sk), &wait); 714 for (;;) { 715 __set_current_state(TASK_INTERRUPTIBLE); 716 rc = -ERESTARTSYS; 717 if (signal_pending(current)) 718 break; 719 rc = sock_error(sk); 720 if (rc) { 721 sk->sk_socket->state = SS_UNCONNECTED; 722 break; 723 } 724 rc = 0; 725 if (sk->sk_state != TCP_ESTABLISHED) { 726 release_sock(sk); 727 schedule(); 728 lock_sock(sk); 729 } else 730 break; 731 } 732 __set_current_state(TASK_RUNNING); 733 remove_wait_queue(sk_sleep(sk), &wait); 734 return rc; 735 } 736 737 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 738 int addr_len, int flags) 739 { 740 struct sock *sk = sock->sk; 741 struct x25_sock *x25 = x25_sk(sk); 742 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 743 struct x25_route *rt; 744 int rc = 0; 745 746 lock_sock(sk); 747 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 748 sock->state = SS_CONNECTED; 749 goto out; /* Connect completed during a ERESTARTSYS event */ 750 } 751 752 rc = -ECONNREFUSED; 753 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 754 sock->state = SS_UNCONNECTED; 755 goto out; 756 } 757 758 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 759 if (sk->sk_state == TCP_ESTABLISHED) 760 goto out; 761 762 sk->sk_state = TCP_CLOSE; 763 sock->state = SS_UNCONNECTED; 764 765 rc = -EINVAL; 766 if (addr_len != sizeof(struct sockaddr_x25) || 767 addr->sx25_family != AF_X25) 768 goto out; 769 770 rc = -ENETUNREACH; 771 rt = x25_get_route(&addr->sx25_addr); 772 if (!rt) 773 goto out; 774 775 x25->neighbour = x25_get_neigh(rt->dev); 776 if (!x25->neighbour) 777 goto out_put_route; 778 779 x25_limit_facilities(&x25->facilities, x25->neighbour); 780 781 x25->lci = x25_new_lci(x25->neighbour); 782 if (!x25->lci) 783 goto out_put_neigh; 784 785 rc = -EINVAL; 786 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 787 goto out_put_neigh; 788 789 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 790 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 791 792 x25->dest_addr = addr->sx25_addr; 793 794 /* Move to connecting socket, start sending Connect Requests */ 795 sock->state = SS_CONNECTING; 796 sk->sk_state = TCP_SYN_SENT; 797 798 x25->state = X25_STATE_1; 799 800 x25_write_internal(sk, X25_CALL_REQUEST); 801 802 x25_start_heartbeat(sk); 803 x25_start_t21timer(sk); 804 805 /* Now the loop */ 806 rc = -EINPROGRESS; 807 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 808 goto out_put_neigh; 809 810 rc = x25_wait_for_connection_establishment(sk); 811 if (rc) 812 goto out_put_neigh; 813 814 sock->state = SS_CONNECTED; 815 rc = 0; 816 out_put_neigh: 817 if (rc) 818 x25_neigh_put(x25->neighbour); 819 out_put_route: 820 x25_route_put(rt); 821 out: 822 release_sock(sk); 823 return rc; 824 } 825 826 static int x25_wait_for_data(struct sock *sk, long timeout) 827 { 828 DECLARE_WAITQUEUE(wait, current); 829 int rc = 0; 830 831 add_wait_queue_exclusive(sk_sleep(sk), &wait); 832 for (;;) { 833 __set_current_state(TASK_INTERRUPTIBLE); 834 if (sk->sk_shutdown & RCV_SHUTDOWN) 835 break; 836 rc = -ERESTARTSYS; 837 if (signal_pending(current)) 838 break; 839 rc = -EAGAIN; 840 if (!timeout) 841 break; 842 rc = 0; 843 if (skb_queue_empty(&sk->sk_receive_queue)) { 844 release_sock(sk); 845 timeout = schedule_timeout(timeout); 846 lock_sock(sk); 847 } else 848 break; 849 } 850 __set_current_state(TASK_RUNNING); 851 remove_wait_queue(sk_sleep(sk), &wait); 852 return rc; 853 } 854 855 static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 856 { 857 struct sock *sk = sock->sk; 858 struct sock *newsk; 859 struct sk_buff *skb; 860 int rc = -EINVAL; 861 862 if (!sk) 863 goto out; 864 865 rc = -EOPNOTSUPP; 866 if (sk->sk_type != SOCK_SEQPACKET) 867 goto out; 868 869 lock_sock(sk); 870 rc = -EINVAL; 871 if (sk->sk_state != TCP_LISTEN) 872 goto out2; 873 874 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 875 if (rc) 876 goto out2; 877 skb = skb_dequeue(&sk->sk_receive_queue); 878 rc = -EINVAL; 879 if (!skb->sk) 880 goto out2; 881 newsk = skb->sk; 882 sock_graft(newsk, newsock); 883 884 /* Now attach up the new socket */ 885 skb->sk = NULL; 886 kfree_skb(skb); 887 sk->sk_ack_backlog--; 888 newsock->state = SS_CONNECTED; 889 rc = 0; 890 out2: 891 release_sock(sk); 892 out: 893 return rc; 894 } 895 896 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 897 int *uaddr_len, int peer) 898 { 899 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 900 struct sock *sk = sock->sk; 901 struct x25_sock *x25 = x25_sk(sk); 902 int rc = 0; 903 904 if (peer) { 905 if (sk->sk_state != TCP_ESTABLISHED) { 906 rc = -ENOTCONN; 907 goto out; 908 } 909 sx25->sx25_addr = x25->dest_addr; 910 } else 911 sx25->sx25_addr = x25->source_addr; 912 913 sx25->sx25_family = AF_X25; 914 *uaddr_len = sizeof(*sx25); 915 916 out: 917 return rc; 918 } 919 920 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 921 unsigned int lci) 922 { 923 struct sock *sk; 924 struct sock *make; 925 struct x25_sock *makex25; 926 struct x25_address source_addr, dest_addr; 927 struct x25_facilities facilities; 928 struct x25_dte_facilities dte_facilities; 929 int len, addr_len, rc; 930 931 /* 932 * Remove the LCI and frame type. 933 */ 934 skb_pull(skb, X25_STD_MIN_LEN); 935 936 /* 937 * Extract the X.25 addresses and convert them to ASCII strings, 938 * and remove them. 939 * 940 * Address block is mandatory in call request packets 941 */ 942 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 943 if (addr_len <= 0) 944 goto out_clear_request; 945 skb_pull(skb, addr_len); 946 947 /* 948 * Get the length of the facilities, skip past them for the moment 949 * get the call user data because this is needed to determine 950 * the correct listener 951 * 952 * Facilities length is mandatory in call request packets 953 */ 954 if (skb->len < 1) 955 goto out_clear_request; 956 len = skb->data[0] + 1; 957 if (skb->len < len) 958 goto out_clear_request; 959 skb_pull(skb,len); 960 961 /* 962 * Find a listener for the particular address/cud pair. 963 */ 964 sk = x25_find_listener(&source_addr,skb); 965 skb_push(skb,len); 966 967 if (sk != NULL && sk_acceptq_is_full(sk)) { 968 goto out_sock_put; 969 } 970 971 /* 972 * We dont have any listeners for this incoming call. 973 * Try forwarding it. 974 */ 975 if (sk == NULL) { 976 skb_push(skb, addr_len + X25_STD_MIN_LEN); 977 if (sysctl_x25_forward && 978 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 979 { 980 /* Call was forwarded, dont process it any more */ 981 kfree_skb(skb); 982 rc = 1; 983 goto out; 984 } else { 985 /* No listeners, can't forward, clear the call */ 986 goto out_clear_request; 987 } 988 } 989 990 /* 991 * Try to reach a compromise on the requested facilities. 992 */ 993 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 994 if (len == -1) 995 goto out_sock_put; 996 997 /* 998 * current neighbour/link might impose additional limits 999 * on certain facilties 1000 */ 1001 1002 x25_limit_facilities(&facilities, nb); 1003 1004 /* 1005 * Try to create a new socket. 1006 */ 1007 make = x25_make_new(sk); 1008 if (!make) 1009 goto out_sock_put; 1010 1011 /* 1012 * Remove the facilities 1013 */ 1014 skb_pull(skb, len); 1015 1016 skb->sk = make; 1017 make->sk_state = TCP_ESTABLISHED; 1018 1019 makex25 = x25_sk(make); 1020 makex25->lci = lci; 1021 makex25->dest_addr = dest_addr; 1022 makex25->source_addr = source_addr; 1023 makex25->neighbour = nb; 1024 makex25->facilities = facilities; 1025 makex25->dte_facilities= dte_facilities; 1026 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1027 /* ensure no reverse facil on accept */ 1028 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1029 /* ensure no calling address extension on accept */ 1030 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1031 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1032 1033 /* Normally all calls are accepted immediately */ 1034 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1035 x25_write_internal(make, X25_CALL_ACCEPTED); 1036 makex25->state = X25_STATE_3; 1037 } 1038 1039 /* 1040 * Incoming Call User Data. 1041 */ 1042 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1043 makex25->calluserdata.cudlength = skb->len; 1044 1045 sk->sk_ack_backlog++; 1046 1047 x25_insert_socket(make); 1048 1049 skb_queue_head(&sk->sk_receive_queue, skb); 1050 1051 x25_start_heartbeat(make); 1052 1053 if (!sock_flag(sk, SOCK_DEAD)) 1054 sk->sk_data_ready(sk, skb->len); 1055 rc = 1; 1056 sock_put(sk); 1057 out: 1058 return rc; 1059 out_sock_put: 1060 sock_put(sk); 1061 out_clear_request: 1062 rc = 0; 1063 x25_transmit_clear_request(nb, lci, 0x01); 1064 goto out; 1065 } 1066 1067 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, 1068 struct msghdr *msg, size_t len) 1069 { 1070 struct sock *sk = sock->sk; 1071 struct x25_sock *x25 = x25_sk(sk); 1072 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; 1073 struct sockaddr_x25 sx25; 1074 struct sk_buff *skb; 1075 unsigned char *asmptr; 1076 int noblock = msg->msg_flags & MSG_DONTWAIT; 1077 size_t size; 1078 int qbit = 0, rc = -EINVAL; 1079 1080 lock_sock(sk); 1081 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1082 goto out; 1083 1084 /* we currently don't support segmented records at the user interface */ 1085 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1086 goto out; 1087 1088 rc = -EADDRNOTAVAIL; 1089 if (sock_flag(sk, SOCK_ZAPPED)) 1090 goto out; 1091 1092 rc = -EPIPE; 1093 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1094 send_sig(SIGPIPE, current, 0); 1095 goto out; 1096 } 1097 1098 rc = -ENETUNREACH; 1099 if (!x25->neighbour) 1100 goto out; 1101 1102 if (usx25) { 1103 rc = -EINVAL; 1104 if (msg->msg_namelen < sizeof(sx25)) 1105 goto out; 1106 memcpy(&sx25, usx25, sizeof(sx25)); 1107 rc = -EISCONN; 1108 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1109 goto out; 1110 rc = -EINVAL; 1111 if (sx25.sx25_family != AF_X25) 1112 goto out; 1113 } else { 1114 /* 1115 * FIXME 1003.1g - if the socket is like this because 1116 * it has become closed (not started closed) we ought 1117 * to SIGPIPE, EPIPE; 1118 */ 1119 rc = -ENOTCONN; 1120 if (sk->sk_state != TCP_ESTABLISHED) 1121 goto out; 1122 1123 sx25.sx25_family = AF_X25; 1124 sx25.sx25_addr = x25->dest_addr; 1125 } 1126 1127 /* Sanity check the packet size */ 1128 if (len > 65535) { 1129 rc = -EMSGSIZE; 1130 goto out; 1131 } 1132 1133 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1134 1135 /* Build a packet */ 1136 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1137 1138 if ((msg->msg_flags & MSG_OOB) && len > 32) 1139 len = 32; 1140 1141 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1142 1143 release_sock(sk); 1144 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1145 lock_sock(sk); 1146 if (!skb) 1147 goto out; 1148 X25_SKB_CB(skb)->flags = msg->msg_flags; 1149 1150 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1151 1152 /* 1153 * Put the data on the end 1154 */ 1155 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1156 1157 skb_reset_transport_header(skb); 1158 skb_put(skb, len); 1159 1160 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len); 1161 if (rc) 1162 goto out_kfree_skb; 1163 1164 /* 1165 * If the Q BIT Include socket option is in force, the first 1166 * byte of the user data is the logical value of the Q Bit. 1167 */ 1168 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1169 qbit = skb->data[0]; 1170 skb_pull(skb, 1); 1171 } 1172 1173 /* 1174 * Push down the X.25 header 1175 */ 1176 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1177 1178 if (msg->msg_flags & MSG_OOB) { 1179 if (x25->neighbour->extended) { 1180 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1181 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1182 *asmptr++ = (x25->lci >> 0) & 0xFF; 1183 *asmptr++ = X25_INTERRUPT; 1184 } else { 1185 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1186 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1187 *asmptr++ = (x25->lci >> 0) & 0xFF; 1188 *asmptr++ = X25_INTERRUPT; 1189 } 1190 } else { 1191 if (x25->neighbour->extended) { 1192 /* Build an Extended X.25 header */ 1193 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1194 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1195 *asmptr++ = (x25->lci >> 0) & 0xFF; 1196 *asmptr++ = X25_DATA; 1197 *asmptr++ = X25_DATA; 1198 } else { 1199 /* Build an Standard X.25 header */ 1200 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1201 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1202 *asmptr++ = (x25->lci >> 0) & 0xFF; 1203 *asmptr++ = X25_DATA; 1204 } 1205 1206 if (qbit) 1207 skb->data[0] |= X25_Q_BIT; 1208 } 1209 1210 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1211 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1212 1213 rc = -ENOTCONN; 1214 if (sk->sk_state != TCP_ESTABLISHED) 1215 goto out_kfree_skb; 1216 1217 if (msg->msg_flags & MSG_OOB) 1218 skb_queue_tail(&x25->interrupt_out_queue, skb); 1219 else { 1220 rc = x25_output(sk, skb); 1221 len = rc; 1222 if (rc < 0) 1223 kfree_skb(skb); 1224 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1225 len++; 1226 } 1227 1228 x25_kick(sk); 1229 rc = len; 1230 out: 1231 release_sock(sk); 1232 return rc; 1233 out_kfree_skb: 1234 kfree_skb(skb); 1235 goto out; 1236 } 1237 1238 1239 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, 1240 struct msghdr *msg, size_t size, 1241 int flags) 1242 { 1243 struct sock *sk = sock->sk; 1244 struct x25_sock *x25 = x25_sk(sk); 1245 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; 1246 size_t copied; 1247 int qbit; 1248 struct sk_buff *skb; 1249 unsigned char *asmptr; 1250 int rc = -ENOTCONN; 1251 1252 lock_sock(sk); 1253 /* 1254 * This works for seqpacket too. The receiver has ordered the queue for 1255 * us! We do one quick check first though 1256 */ 1257 if (sk->sk_state != TCP_ESTABLISHED) 1258 goto out; 1259 1260 if (flags & MSG_OOB) { 1261 rc = -EINVAL; 1262 if (sock_flag(sk, SOCK_URGINLINE) || 1263 !skb_peek(&x25->interrupt_in_queue)) 1264 goto out; 1265 1266 skb = skb_dequeue(&x25->interrupt_in_queue); 1267 1268 skb_pull(skb, X25_STD_MIN_LEN); 1269 1270 /* 1271 * No Q bit information on Interrupt data. 1272 */ 1273 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1274 asmptr = skb_push(skb, 1); 1275 *asmptr = 0x00; 1276 } 1277 1278 msg->msg_flags |= MSG_OOB; 1279 } else { 1280 /* Now we can treat all alike */ 1281 release_sock(sk); 1282 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1283 flags & MSG_DONTWAIT, &rc); 1284 lock_sock(sk); 1285 if (!skb) 1286 goto out; 1287 1288 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1289 1290 skb_pull(skb, x25->neighbour->extended ? 1291 X25_EXT_MIN_LEN : X25_STD_MIN_LEN); 1292 1293 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1294 asmptr = skb_push(skb, 1); 1295 *asmptr = qbit; 1296 } 1297 } 1298 1299 skb_reset_transport_header(skb); 1300 copied = skb->len; 1301 1302 if (copied > size) { 1303 copied = size; 1304 msg->msg_flags |= MSG_TRUNC; 1305 } 1306 1307 /* Currently, each datagram always contains a complete record */ 1308 msg->msg_flags |= MSG_EOR; 1309 1310 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1311 if (rc) 1312 goto out_free_dgram; 1313 1314 if (sx25) { 1315 sx25->sx25_family = AF_X25; 1316 sx25->sx25_addr = x25->dest_addr; 1317 } 1318 1319 msg->msg_namelen = sizeof(struct sockaddr_x25); 1320 1321 x25_check_rbuf(sk); 1322 rc = copied; 1323 out_free_dgram: 1324 skb_free_datagram(sk, skb); 1325 out: 1326 release_sock(sk); 1327 return rc; 1328 } 1329 1330 1331 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1332 { 1333 struct sock *sk = sock->sk; 1334 struct x25_sock *x25 = x25_sk(sk); 1335 void __user *argp = (void __user *)arg; 1336 int rc; 1337 1338 switch (cmd) { 1339 case TIOCOUTQ: { 1340 int amount; 1341 1342 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1343 if (amount < 0) 1344 amount = 0; 1345 rc = put_user(amount, (unsigned int __user *)argp); 1346 break; 1347 } 1348 1349 case TIOCINQ: { 1350 struct sk_buff *skb; 1351 int amount = 0; 1352 /* 1353 * These two are safe on a single CPU system as 1354 * only user tasks fiddle here 1355 */ 1356 lock_sock(sk); 1357 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1358 amount = skb->len; 1359 release_sock(sk); 1360 rc = put_user(amount, (unsigned int __user *)argp); 1361 break; 1362 } 1363 1364 case SIOCGSTAMP: 1365 rc = -EINVAL; 1366 if (sk) 1367 rc = sock_get_timestamp(sk, 1368 (struct timeval __user *)argp); 1369 break; 1370 case SIOCGSTAMPNS: 1371 rc = -EINVAL; 1372 if (sk) 1373 rc = sock_get_timestampns(sk, 1374 (struct timespec __user *)argp); 1375 break; 1376 case SIOCGIFADDR: 1377 case SIOCSIFADDR: 1378 case SIOCGIFDSTADDR: 1379 case SIOCSIFDSTADDR: 1380 case SIOCGIFBRDADDR: 1381 case SIOCSIFBRDADDR: 1382 case SIOCGIFNETMASK: 1383 case SIOCSIFNETMASK: 1384 case SIOCGIFMETRIC: 1385 case SIOCSIFMETRIC: 1386 rc = -EINVAL; 1387 break; 1388 case SIOCADDRT: 1389 case SIOCDELRT: 1390 rc = -EPERM; 1391 if (!capable(CAP_NET_ADMIN)) 1392 break; 1393 rc = x25_route_ioctl(cmd, argp); 1394 break; 1395 case SIOCX25GSUBSCRIP: 1396 rc = x25_subscr_ioctl(cmd, argp); 1397 break; 1398 case SIOCX25SSUBSCRIP: 1399 rc = -EPERM; 1400 if (!capable(CAP_NET_ADMIN)) 1401 break; 1402 rc = x25_subscr_ioctl(cmd, argp); 1403 break; 1404 case SIOCX25GFACILITIES: { 1405 lock_sock(sk); 1406 rc = copy_to_user(argp, &x25->facilities, 1407 sizeof(x25->facilities)) 1408 ? -EFAULT : 0; 1409 release_sock(sk); 1410 break; 1411 } 1412 1413 case SIOCX25SFACILITIES: { 1414 struct x25_facilities facilities; 1415 rc = -EFAULT; 1416 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1417 break; 1418 rc = -EINVAL; 1419 lock_sock(sk); 1420 if (sk->sk_state != TCP_LISTEN && 1421 sk->sk_state != TCP_CLOSE) 1422 goto out_fac_release; 1423 if (facilities.pacsize_in < X25_PS16 || 1424 facilities.pacsize_in > X25_PS4096) 1425 goto out_fac_release; 1426 if (facilities.pacsize_out < X25_PS16 || 1427 facilities.pacsize_out > X25_PS4096) 1428 goto out_fac_release; 1429 if (facilities.winsize_in < 1 || 1430 facilities.winsize_in > 127) 1431 goto out_fac_release; 1432 if (facilities.throughput) { 1433 int out = facilities.throughput & 0xf0; 1434 int in = facilities.throughput & 0x0f; 1435 if (!out) 1436 facilities.throughput |= 1437 X25_DEFAULT_THROUGHPUT << 4; 1438 else if (out < 0x30 || out > 0xD0) 1439 goto out_fac_release; 1440 if (!in) 1441 facilities.throughput |= 1442 X25_DEFAULT_THROUGHPUT; 1443 else if (in < 0x03 || in > 0x0D) 1444 goto out_fac_release; 1445 } 1446 if (facilities.reverse && 1447 (facilities.reverse & 0x81) != 0x81) 1448 goto out_fac_release; 1449 x25->facilities = facilities; 1450 rc = 0; 1451 out_fac_release: 1452 release_sock(sk); 1453 break; 1454 } 1455 1456 case SIOCX25GDTEFACILITIES: { 1457 lock_sock(sk); 1458 rc = copy_to_user(argp, &x25->dte_facilities, 1459 sizeof(x25->dte_facilities)); 1460 release_sock(sk); 1461 if (rc) 1462 rc = -EFAULT; 1463 break; 1464 } 1465 1466 case SIOCX25SDTEFACILITIES: { 1467 struct x25_dte_facilities dtefacs; 1468 rc = -EFAULT; 1469 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1470 break; 1471 rc = -EINVAL; 1472 lock_sock(sk); 1473 if (sk->sk_state != TCP_LISTEN && 1474 sk->sk_state != TCP_CLOSE) 1475 goto out_dtefac_release; 1476 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1477 goto out_dtefac_release; 1478 if (dtefacs.calling_ae == NULL) 1479 goto out_dtefac_release; 1480 if (dtefacs.called_len > X25_MAX_AE_LEN) 1481 goto out_dtefac_release; 1482 if (dtefacs.called_ae == NULL) 1483 goto out_dtefac_release; 1484 x25->dte_facilities = dtefacs; 1485 rc = 0; 1486 out_dtefac_release: 1487 release_sock(sk); 1488 break; 1489 } 1490 1491 case SIOCX25GCALLUSERDATA: { 1492 lock_sock(sk); 1493 rc = copy_to_user(argp, &x25->calluserdata, 1494 sizeof(x25->calluserdata)) 1495 ? -EFAULT : 0; 1496 release_sock(sk); 1497 break; 1498 } 1499 1500 case SIOCX25SCALLUSERDATA: { 1501 struct x25_calluserdata calluserdata; 1502 1503 rc = -EFAULT; 1504 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1505 break; 1506 rc = -EINVAL; 1507 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1508 break; 1509 lock_sock(sk); 1510 x25->calluserdata = calluserdata; 1511 release_sock(sk); 1512 rc = 0; 1513 break; 1514 } 1515 1516 case SIOCX25GCAUSEDIAG: { 1517 lock_sock(sk); 1518 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1519 ? -EFAULT : 0; 1520 release_sock(sk); 1521 break; 1522 } 1523 1524 case SIOCX25SCAUSEDIAG: { 1525 struct x25_causediag causediag; 1526 rc = -EFAULT; 1527 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1528 break; 1529 lock_sock(sk); 1530 x25->causediag = causediag; 1531 release_sock(sk); 1532 rc = 0; 1533 break; 1534 1535 } 1536 1537 case SIOCX25SCUDMATCHLEN: { 1538 struct x25_subaddr sub_addr; 1539 rc = -EINVAL; 1540 lock_sock(sk); 1541 if(sk->sk_state != TCP_CLOSE) 1542 goto out_cud_release; 1543 rc = -EFAULT; 1544 if (copy_from_user(&sub_addr, argp, 1545 sizeof(sub_addr))) 1546 goto out_cud_release; 1547 rc = -EINVAL; 1548 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1549 goto out_cud_release; 1550 x25->cudmatchlength = sub_addr.cudmatchlength; 1551 rc = 0; 1552 out_cud_release: 1553 release_sock(sk); 1554 break; 1555 } 1556 1557 case SIOCX25CALLACCPTAPPRV: { 1558 rc = -EINVAL; 1559 lock_sock(sk); 1560 if (sk->sk_state != TCP_CLOSE) 1561 break; 1562 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1563 release_sock(sk); 1564 rc = 0; 1565 break; 1566 } 1567 1568 case SIOCX25SENDCALLACCPT: { 1569 rc = -EINVAL; 1570 lock_sock(sk); 1571 if (sk->sk_state != TCP_ESTABLISHED) 1572 break; 1573 /* must call accptapprv above */ 1574 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1575 break; 1576 x25_write_internal(sk, X25_CALL_ACCEPTED); 1577 x25->state = X25_STATE_3; 1578 release_sock(sk); 1579 rc = 0; 1580 break; 1581 } 1582 1583 default: 1584 rc = -ENOIOCTLCMD; 1585 break; 1586 } 1587 1588 return rc; 1589 } 1590 1591 static const struct net_proto_family x25_family_ops = { 1592 .family = AF_X25, 1593 .create = x25_create, 1594 .owner = THIS_MODULE, 1595 }; 1596 1597 #ifdef CONFIG_COMPAT 1598 static int compat_x25_subscr_ioctl(unsigned int cmd, 1599 struct compat_x25_subscrip_struct __user *x25_subscr32) 1600 { 1601 struct compat_x25_subscrip_struct x25_subscr; 1602 struct x25_neigh *nb; 1603 struct net_device *dev; 1604 int rc = -EINVAL; 1605 1606 rc = -EFAULT; 1607 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1608 goto out; 1609 1610 rc = -EINVAL; 1611 dev = x25_dev_get(x25_subscr.device); 1612 if (dev == NULL) 1613 goto out; 1614 1615 nb = x25_get_neigh(dev); 1616 if (nb == NULL) 1617 goto out_dev_put; 1618 1619 dev_put(dev); 1620 1621 if (cmd == SIOCX25GSUBSCRIP) { 1622 read_lock_bh(&x25_neigh_list_lock); 1623 x25_subscr.extended = nb->extended; 1624 x25_subscr.global_facil_mask = nb->global_facil_mask; 1625 read_unlock_bh(&x25_neigh_list_lock); 1626 rc = copy_to_user(x25_subscr32, &x25_subscr, 1627 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1628 } else { 1629 rc = -EINVAL; 1630 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1631 rc = 0; 1632 write_lock_bh(&x25_neigh_list_lock); 1633 nb->extended = x25_subscr.extended; 1634 nb->global_facil_mask = x25_subscr.global_facil_mask; 1635 write_unlock_bh(&x25_neigh_list_lock); 1636 } 1637 } 1638 x25_neigh_put(nb); 1639 out: 1640 return rc; 1641 out_dev_put: 1642 dev_put(dev); 1643 goto out; 1644 } 1645 1646 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1647 unsigned long arg) 1648 { 1649 void __user *argp = compat_ptr(arg); 1650 struct sock *sk = sock->sk; 1651 1652 int rc = -ENOIOCTLCMD; 1653 1654 switch(cmd) { 1655 case TIOCOUTQ: 1656 case TIOCINQ: 1657 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1658 break; 1659 case SIOCGSTAMP: 1660 rc = -EINVAL; 1661 if (sk) 1662 rc = compat_sock_get_timestamp(sk, 1663 (struct timeval __user*)argp); 1664 break; 1665 case SIOCGSTAMPNS: 1666 rc = -EINVAL; 1667 if (sk) 1668 rc = compat_sock_get_timestampns(sk, 1669 (struct timespec __user*)argp); 1670 break; 1671 case SIOCGIFADDR: 1672 case SIOCSIFADDR: 1673 case SIOCGIFDSTADDR: 1674 case SIOCSIFDSTADDR: 1675 case SIOCGIFBRDADDR: 1676 case SIOCSIFBRDADDR: 1677 case SIOCGIFNETMASK: 1678 case SIOCSIFNETMASK: 1679 case SIOCGIFMETRIC: 1680 case SIOCSIFMETRIC: 1681 rc = -EINVAL; 1682 break; 1683 case SIOCADDRT: 1684 case SIOCDELRT: 1685 rc = -EPERM; 1686 if (!capable(CAP_NET_ADMIN)) 1687 break; 1688 rc = x25_route_ioctl(cmd, argp); 1689 break; 1690 case SIOCX25GSUBSCRIP: 1691 rc = compat_x25_subscr_ioctl(cmd, argp); 1692 break; 1693 case SIOCX25SSUBSCRIP: 1694 rc = -EPERM; 1695 if (!capable(CAP_NET_ADMIN)) 1696 break; 1697 rc = compat_x25_subscr_ioctl(cmd, argp); 1698 break; 1699 case SIOCX25GFACILITIES: 1700 case SIOCX25SFACILITIES: 1701 case SIOCX25GDTEFACILITIES: 1702 case SIOCX25SDTEFACILITIES: 1703 case SIOCX25GCALLUSERDATA: 1704 case SIOCX25SCALLUSERDATA: 1705 case SIOCX25GCAUSEDIAG: 1706 case SIOCX25SCAUSEDIAG: 1707 case SIOCX25SCUDMATCHLEN: 1708 case SIOCX25CALLACCPTAPPRV: 1709 case SIOCX25SENDCALLACCPT: 1710 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1711 break; 1712 default: 1713 rc = -ENOIOCTLCMD; 1714 break; 1715 } 1716 return rc; 1717 } 1718 #endif 1719 1720 static const struct proto_ops x25_proto_ops = { 1721 .family = AF_X25, 1722 .owner = THIS_MODULE, 1723 .release = x25_release, 1724 .bind = x25_bind, 1725 .connect = x25_connect, 1726 .socketpair = sock_no_socketpair, 1727 .accept = x25_accept, 1728 .getname = x25_getname, 1729 .poll = datagram_poll, 1730 .ioctl = x25_ioctl, 1731 #ifdef CONFIG_COMPAT 1732 .compat_ioctl = compat_x25_ioctl, 1733 #endif 1734 .listen = x25_listen, 1735 .shutdown = sock_no_shutdown, 1736 .setsockopt = x25_setsockopt, 1737 .getsockopt = x25_getsockopt, 1738 .sendmsg = x25_sendmsg, 1739 .recvmsg = x25_recvmsg, 1740 .mmap = sock_no_mmap, 1741 .sendpage = sock_no_sendpage, 1742 }; 1743 1744 static struct packet_type x25_packet_type __read_mostly = { 1745 .type = cpu_to_be16(ETH_P_X25), 1746 .func = x25_lapb_receive_frame, 1747 }; 1748 1749 static struct notifier_block x25_dev_notifier = { 1750 .notifier_call = x25_device_event, 1751 }; 1752 1753 void x25_kill_by_neigh(struct x25_neigh *nb) 1754 { 1755 struct sock *s; 1756 struct hlist_node *node; 1757 1758 write_lock_bh(&x25_list_lock); 1759 1760 sk_for_each(s, node, &x25_list) 1761 if (x25_sk(s)->neighbour == nb) 1762 x25_disconnect(s, ENETUNREACH, 0, 0); 1763 1764 write_unlock_bh(&x25_list_lock); 1765 1766 /* Remove any related forwards */ 1767 x25_clear_forward_by_dev(nb->dev); 1768 } 1769 1770 static int __init x25_init(void) 1771 { 1772 int rc = proto_register(&x25_proto, 0); 1773 1774 if (rc != 0) 1775 goto out; 1776 1777 rc = sock_register(&x25_family_ops); 1778 if (rc != 0) 1779 goto out_proto; 1780 1781 dev_add_pack(&x25_packet_type); 1782 1783 rc = register_netdevice_notifier(&x25_dev_notifier); 1784 if (rc != 0) 1785 goto out_sock; 1786 1787 printk(KERN_INFO "X.25 for Linux Version 0.2\n"); 1788 1789 x25_register_sysctl(); 1790 rc = x25_proc_init(); 1791 if (rc != 0) 1792 goto out_dev; 1793 out: 1794 return rc; 1795 out_dev: 1796 unregister_netdevice_notifier(&x25_dev_notifier); 1797 out_sock: 1798 sock_unregister(AF_X25); 1799 out_proto: 1800 proto_unregister(&x25_proto); 1801 goto out; 1802 } 1803 module_init(x25_init); 1804 1805 static void __exit x25_exit(void) 1806 { 1807 x25_proc_exit(); 1808 x25_link_free(); 1809 x25_route_free(); 1810 1811 x25_unregister_sysctl(); 1812 1813 unregister_netdevice_notifier(&x25_dev_notifier); 1814 1815 dev_remove_pack(&x25_packet_type); 1816 1817 sock_unregister(AF_X25); 1818 proto_unregister(&x25_proto); 1819 } 1820 module_exit(x25_exit); 1821 1822 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1823 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1824 MODULE_LICENSE("GPL"); 1825 MODULE_ALIAS_NETPROTO(PF_X25); 1826